1. Cut the tomatoes and put them in the large pan with olive oil, salt and a lot of oregano
2. Cook them for about 15 min
3. Add the tuna fish, cut in small pieces and let it cook for 2 min
4. Put spaghetti in a pan of boiling water and cook until ready (al dente)
5. Drain the pasta and add to the tuna and tomato mix, stirring constantly, and serve immediately with a lot of basil.